chore(deps): bump postcss in /examples/example-app-v17 (#2200)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.21 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.21...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/example-app-v17/yarn.lock

@@ -8688,15 +8688,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"nanoid@npm:^3.3.4":
-  version: 3.3.4
-  resolution: "nanoid@npm:3.3.4"
-  bin:
-    nanoid: bin/nanoid.cjs
-  checksum: 2fddd6dee994b7676f008d3ffa4ab16035a754f4bb586c61df5a22cf8c8c94017aadd360368f47d653829e0569a92b129979152ff97af23a558331e47e37cd9c
-  languageName: node
-  linkType: hard
-
 "nanoid@npm:^3.3.6":
   version: 3.3.7
   resolution: "nanoid@npm:3.3.7"
@@ -9519,7 +9510,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:8.4.31, postcss@npm:^8.4.21, postcss@npm:^8.4.23, postcss@npm:^8.4.27":
+"postcss@npm:8.4.31, postcss@npm:^8.2.14, postcss@npm:^8.4.21, postcss@npm:^8.4.23, postcss@npm:^8.4.27":
   version: 8.4.31
   resolution: "postcss@npm:8.4.31"
   dependencies:
@@ -9530,17 +9521,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.2.14":
-  version: 8.4.21
-  resolution: "postcss@npm:8.4.21"
-  dependencies:
-    nanoid: ^3.3.4
-    picocolors: ^1.0.0
-    source-map-js: ^1.0.2
-  checksum: e39ac60ccd1542d4f9d93d894048aac0d686b3bb38e927d8386005718e6793dbbb46930f0a523fe382f1bbd843c6d980aaea791252bf5e176180e5a4336d9679
-  languageName: node
-  linkType: hard
-
 "prelude-ls@npm:~1.1.2":
   version: 1.1.2
   resolution: "prelude-ls@npm:1.1.2"